Mitsubishi Electric MELSEC Q80BD-J71GF11-T2, User Manual

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13 DIAGNOSING BOARD STATUS
13.2 Diagnosing CC-Link IE Field Network
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When is displayed in "Network Status"
<The system does not contain a switching hub.>
Although the loopback function is disabled, the network is configured in ring topology.
Perform the following measures.
• When not using the loopback function
Disconnect an Ethernet cable connected to any stations on the network (either PORT1 or PORT2).
The network topology will become a line topology and data link will start.
• When using the loopback function
Enable the loopback function and rewrite the network parameter to the board. (

Page 78 Loopback Function)
When a master/local module is used for the master station, check if the master/local module supports the loopback
function.
If the master/local module does not support the loopback function, replace the module with the one which supports the
loopback function.
<The system contains a switching hub.>
is displayed by any of the following causes.
• Although the loopback function is disabled, the network is configured in ring topology.
• Although the loopback function is enabled, the network is configured in star topology.
• The network is incorrectly configured in ring topology.
Perform the following measures.
• Check if the loopback function setting is correctly configured. (

Page 78 Loopback Function)
If incorrect, correct the network parameter and rewrite it to the board.
When data link starts over the network, the action is successful.
• When the loopback function is disabled, perform the following measures.
Disconnect an Ethernet cable connected to the switching hub and power cycle the hub. (Repeat this operation until data
link starts over the network.)
When data link starts over the network, check the network configuration by CC-Link IE Field Network diagnostics.
• When the loopback function is enabled, perform the following measures.
Configure the network in ring topology without a switching hub.
Connecting a switching hub will cause a problem such as data link failure. (

Page 25 Configuration in which data link
cannot be performed (incorrect ring topology))
When a master/local module is used for the master station, check if the master/local module supports the loopback
function.
If the master/local module does not support the loopback function, replace the module with the one which supports the
loopback function.